A fired heater (heater) is used to heat a process stream containing an intermediate product that will be sent to a downstream reactor. It is not only important to maintain a constant outlet temperature but also to keep the furnace temperature below a certain critical value for safety reasons (metallurgical limits of the furnace tubes). A simple schematic representation is shown in the following figure. 1. What is the control objective for this process? 2. Identify all external disturbances that could affect the operation of the furnace. 3. Identify all manipulated variables for the control of this unit in the presence of disturbances. 4. Construct a feedback control configuration and a feedforward control configuration that would satisfy the control objectives in the presence of disturbances